Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2652 00: Passenger Compartment Dimming 3Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Body Control Module (BCM) VB4 Fuse B+ | B1395 03 | B1395 03 | -- | -- |
DIM Fuse B+ | B2652 00 | B2652 00 | -- | -- |
I/P Dimmer Switch B+ Voltage Reference | B1395 03, B3600 03 | B3600 03 | -- | -- |
I/P Lamps Dimmer Switch Signal | B2652 00 | -- | -- | -- |
I/P Dimmer Switch Signal | B1395 03, B3600 03 | B3600 03 | 1 | -- |
LED Backlight Dimming Control | B2610 00 | 1 | 1 | -- |
I/P dimmer Switch Ground | -- | 1 | -- | -- |
1. Interior Backlighting Malfunction | ||||
Circuit/System Description
The instrument panel (I/P) lamp dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the I/P lamps supply voltage circuit and the interior backlighting components dim to the requested level. Ground for the I/P dimmer switch is provided at G201.
Conditions for Running the DTC
| • | Battery voltage must be between 9-16 volts. |
| • | Park lamps ON. |
Conditions for Setting the DTC
DTC B2652 00 will set for the following conditions:
| • | The BCM detects a short to ground in the I/P lamps dimmer switch signal circuit. |
| • | The BCM detects a short to ground or an open/high resistance in the DIM fuse B+ circuit. |
Action Taken When the DTC Sets
The BCM will not DIM or illuminate any I/P lamps supplied by the I/P lamps dimmer switch signal circuit.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred. |
Reference Information
Schematic Reference
Interior Lights Dimming Schematics
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the X2 harness connector at the BCM.
- Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
- Reconnect the X2 harness connector at the BCM.
- Ignition ON, with a scan tool clear all DTCs.
- Ignition OFF, disconnect the harness connectors at the following components:
- Ignition ON, operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
- Reconnect each component one at a time and verify the DTC does not reset as current.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| • | Garage door opener |
| • | PRNDL lamp |
| • | Rear seat audio (RSA) control harness connector X1 |
| ⇒ | If the DTC resets, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM. |
| • | Garage door opener terminal 2 |
| • | PRNDL lamp terminal 2 |
| • | Rear seat audio (RSA) terminal 7 X1 |
| ⇒ | If the DTC resets as current, test or replace the component responsible for setting the DTC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
